package com.onlyphoto.onlymall.widget;


import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import androidx.appcompat.widget.AppCompatEditText;

import com.onlyphoto.onlymall.R;
import com.onlyphoto.onlymall.utils.ConvertUtil;

import java.util.ArrayList;
import java.util.List;

public class ClearEditText extends AppCompatEditText {
    /**
     * 图标的偏移位置
     */
    private int x = 0;
    /**
     * 删除按钮的引用
     */
    private Drawable mClearDrawable;
    /**
     * 控件是否有焦点
     */
    private boolean hasFoucs;
    /**
     * 是否弹出自定义键盘，如果是的话，那么touch事件需要改动
     * <br/>true的话在重写touch事件的时候可以return false
     */

    public ClearEditText(Context context) {
        this(context, null);
        addTextViewEvent();
    }

    public ClearEditText(Context context, AttributeSet attrs) {
        // 这里构造方法也很重要，不加这个很多属性不能再XML里面定义
        this(context, attrs, android.R.attr.editTextStyle);
        addTextViewEvent();
    }

    public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
        addTextViewEvent();
    }

    private void init(Context context) {
        // 设置清除图标
        mClearDrawable = getResources().getDrawable(R.mipmap.edt_clear);
        // 设置图标位置
        x = ConvertUtil.dp2px(context, 4);
        mClearDrawable.setBounds(-x, 0, mClearDrawable.getIntrinsicWidth() - x, mClearDrawable.getIntrinsicHeight());
        // 默认设置隐藏图标
        setClearIconVisible(false);
    }

    /**
     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向就没有考虑
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            if (getCompoundDrawables()[2] != null) {
                boolean touchable = event.getX() > (getWidth() - x - getTotalPaddingRight())
                        && (event.getX() < ((getWidth() - x - getPaddingRight())));
                if (touchable) {
                    this.setText("");
                }
            }
        }
        return super.onTouchEvent(event);
    }


    /**
     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
     *
     * @param visible
     */
    protected void setClearIconVisible(boolean visible) {
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }


    private void addTextViewEvent() {
        this.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if (hasFoucs) {
                    setClearIconVisible(s.length() > 0);
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                                          int after) {
            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        });
        super.setOnFocusChangeListener((v, hasFocus) -> {
            if (focusListeners != null) {
                for (int i = 0; i < focusListeners.size(); i++) {
                    focusListeners.get(i).onFocusChange(v, hasFocus);
                }
            }

            ClearEditText.this.hasFoucs = hasFocus;
            if (hasFocus) {
                setClearIconVisible(getText().length() > 0);
            } else {
                setClearIconVisible(false);
            }
        });
    }


    List<View.OnFocusChangeListener> focusListeners;

    @Override
    public void setOnFocusChangeListener(View.OnFocusChangeListener l) {
        if (focusListeners == null) {
            focusListeners = new ArrayList<>();
        }
        focusListeners.add(l);
    }
}

